Counterbalance device.



Witnesses:

WWW

, W. J. HAGMAN. OOUNTERBALANGE-DEVIGE.

' APPLICATION FILED MAY 26. 1905.

PATENTEID MAR. 20, 1906.

Invenfior Attorney v the following is a specification.

UNITED STATES PATENT OFFICE.

- WILLIAM J. HAGMAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NILES-BEMENT-POND COMPANY, OF JERSEY CITY, NEW JERSEY.

Specification of Letters Patent.

'ratented March 20, 1906.

Application filed May 26, 1906. Serial No. 262,4:42.

To all whom it may concern:

Be it known that I, WILLIAM J. HAGMAN, a citizen of the United States, residing at Philadelphia, Philadelphia county, Pennsylvania, (post-office address, care Bement, Miles & Company, Philadelphia, Pennsylvania,) have invented certain new and useful Improvements in Counterbalance Devices, of which This invention, pertaining to counterbalancing devices, will be readily understood from the following description, taken'in connection with the.accompanying drawings, in which Figure I is a front elevation of the saddle and adjuncts of an ordinary metal-planing machine, its vertically-moving parts being counterbalanced by means of my invention; and Fig. 2, a side elevation of the same.

My improved counterbalance is a plicable' to a great'varietyiof situations, an in illustrating the invention in connection with the parts of a metal-planing machine I desire it to be understood that such use of my invention is merely exemplifying.

In the drawings, 1 indicates the saddle of a metal-planing machine; 2, the swing; 3, the slide; 4, the tool-box; 5, the apron; 6, the toolclamping screws; 7, the vertical feed-screw, all. the parts thus far referred to being of ordinary construction; 8 an electric motor fixed to the slide; 9, a pinion'on the armature-shaft of the motor; 10, a vertical rack formed upon or secured to the swing, and 11 an intermediate gear carried by the slide and engaging the pinion and the rack.

Current being properly applied to the motor, it is manifest that the tendency of the motor is to elevate theslide and the parts at tached to it and that if there was sufficient power in the motor the motor would raise the slide if the vertical feed-screw did not interfere. The power of the motor is to be such as to support all or the major portion of the weight of the slide and the parts carried by it including the motor, the result being that the motor, while potent for work, is normally without motor motion, its effect being merely to counterbalance the weight of the vertically- A movin parts, the armature advanclng when the sli e is raised by the action of the screw and turning backward when the slide is lowered by the action of the screw, the motor standingat all'times under conditions such that its torque sustains all or a major portion of the weight of the vertically-moving parts. The motor is shown as being on the verticallymoving part and the rack as being on the fixed part. If these positions were transposed, the efiiect would be the same, or, stated otherwise, if the slide 3 were fixed against vertical motion and the swing and saddle were intended to be the vertically-moving parts to be counterbalanced then the motor would manifestly fulfil the counterbalancing office.

I claim as my invention- A substantially vertical guide way, a heavy machine part mounted for vertical adjustment therein, hand-operable mechanism for vertically adjusting said machine part and holding it in adjusted position, an electric motor, and a connection between said motor and machine part whereby the energy of the motor tends to assist the hand-operable mechanism in elevating said machine part.

WILLIAM J. I-IAGMAN.

Witnesses W. T. SEARS, SAMUEL C, KANE. 

